TY - JOUR AU - Marrs, Richard, P. AB - Article PDF first page preview Close This content is only available as a PDF. © Oxford University Press TI - Letters to the Editor JF - Human Reproduction DO - 10.1093/oxfordjournals.humrep.a137453 DA - 1991-08-01 UR - https://www.deepdyve.com/lp/oxford-university-press/letters-to-the-editor-rBQtiXNY6U SP - 1022 EP - 1022 VL - 6 IS - 7 DP - DeepDyve ER -